The ejection fraction (EF) is commonly used as an index of cardiac function. It usually refers to the EF of the left ventricle, which is the ratio of left ventricular stroke volume to left ventricular end-diastolic volume.
The purpose of this study was to investigate whether there were significant differences in the intensity distributions of thoracic aorta hemodynamic parameters between groups with different ejection fractions (EF) using four-dimensional flow magnetic resonance imaging and to investigate the relationships between each parameter.
The show that the intensity distributions of WSS(Wall Shear Stress), EL(Energy Loss), and Vort(Vorticity) in the thoracic aorta were examined, and significantly concordance was seen between the intensity distributions of EL and Vort. The only significant differences between the EF groups were found in the intensity distributions of EL and Vort in the distal AAo. This suggests that the distributions of atherosclerosis might depend on the EF.

Takamasa Nishimura, MD, ∗ Eijun Sueyoshi, MD, Hirofumi Koike, MD, and Masataka Uetani, MD, "Initial experience with intensity distribution analysis of hemodynamic parameters in the thoracic aorta using four-dimensional magnetic resonance imaging", Medicine (Baltimore), Published online (2022) 10.1097/MD.0000000000028563.